Hashing

Updated 31 Jul 2026

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def
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  a one-way cryptographic process that derives a fixed-format value (a Hash Digest) from input data; the digest cannot be reversed back into the original input
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purpose
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  protects Integrity — used to detect whether data has changed
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analogy
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  like running a potato through a shredder to get hash browns — you can run the potato through and get hash browns, but you cannot run the hash browns back through and get the potato back
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uses
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  detecting file or software tampering
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  Password Hashing
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  Digital Signature and Code Signing
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related
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cards
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  Why can't you reverse a hash back into the original input?
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    Hashing is a one-way process by design — it derives a fixed-length digest, but the digest can't be mathematically reversed to recover the original data

Linked references 13